Circle segmentator



Feb. 10, 1931.

A. O.-TATE CIRCLE SEGMENTA'I'OR 2 Sheets-She 1 Filed Nov. 7, 1928] Feb; 10, .1931.

2 Sheets-Sheet 2 Q m 3 3 N Y 2 F A w. NQNW f urn-H bw w ha Z fig ST i k m m u& M

' -of variation; to so plishing PatentedFeb. 1Q, 1931 v v 7 I UNITED 5m PTE -ALFRED ounn rr'arn, F roaou'ro, oNTARIq-GnNADA I CIRCLE sEsMEurA'roR V A ucau n'fi q November-7, 1923. Serial mja zsss.

This invention relates to an instrument or device for guiding a tool or marker in making or engraving arcuate or circumferential and radial markings or lines on a: plate or disc,

- as described in the present specification and y illustrated in the accompanying drawings which form part of same.

The invention consists essentially. of thenovel features pointed out broadly and specifically in the claims for novelty follow-.

ing a description containing an'explanation in detail of an acceptable form of the invention. v

The objects of the invention are to reduce the time and labour required in making circumferentialand radial lines or markings on a plate or disc; to" facilitate'the location of a certain point in regard to a common centre; to allow for the finest adjustment of the marker with regard to a certain'point Ion the surface of a plate or planed surface without difliculty or undue eye strain; to aid in the reproduction ofthe markings on different plates or planed surfaces with a minimum constructsuch a device or an engraving tool or the like; and gen- I erally, to provide adevice rugged in construction, simple in form, and'capable of accomthe aforesaid results and'purposes. I may further state that the necessity for an instrument embodying these functions was indicated to me by my'wor'k in'ma rking or engraving discs with radial andcircumferof the device complete. p c

Figure 2 is an end elevational view showing the angular adjustment, 7 1 Figure 3 is-a fragmentary section View tak- 1 onl nes 3- n g reL;

that it may carry either a-marker or pencil is preferably slightly offset from No.'311,118, filed October 8,

Inthe drawings, Figure 1 .is a plan view Figure 1 is a fragmentary plan view show- Y mg the different ad uStments.

Figure=5 1s a fragmentary section view taken on lines 5-5 1n Figure 3. r

Figure 6 is a fragmentary section view '55 showing a tool mounted for engraving.

Like numerals of reference indicate corresponding parts in the various figures. Referring to the drawings, the numeral 10 indicatesthe' devicecomplete mounted on are table or platform 11. The platform llconsists essentially of a planedtog-preferably a rlgid metal plate 12 suitably supported on a framework or base 13. The instrument consists essentially of a plate 15:pivotally mount- J ed at its centralaxison a bearing disc 16 rigid zwith theplate 12 and at thecentral axis thereof andan arm- 17 rigid with'the portion 15 and extending-therefroma-distance and being of 'the same cross sectionf'te throughout its length, anda pencil or marker 18 reciprocally carried on the bar 17 .7 'The :bar 17 is offset from and parallel with a radial line passing through the central axis or the pivotal point of the plate 15 as indicated at -35 B in Figure 4, so'that thepoint of thepencil or marker 18 which is carriedon a ferrule or sleeve 19 reclprocally'mounted on the bar 17 will fall directly on said. radial line when saidferrule is recip'rocated on the bar 17.

The bar 17 'is so mounted that it-will be adacent to and substantially parallel with the surface of the plate 12. In order to do this, it

the plate 15-to which it is secured as at 17a. The plate s 15 is rotatably mounted on the pivotal bear- ,ing 16 and secured-in position by a suitable bolt 'o'r cap screw 15?) at the central axis and is so-mounted that there will'be a minimum of side play when the bar 17 is pivoted about so the central axis of the pivoting point. In order to reduce to a minimum any thrust or lo'oseness in; the pivotalmounting of the plate 15 on the bearing'16, a raised ring -15ais formed on the under side of the plate '15 adapted to snugly-fit in a circular groove 16a formedo'n the upper surface of the bearing plate 16.

- Thenume'ral 24 indicates any plate or disc onfwhich the markings or engravings are to Ice be placed. An opening 25 is formed therethrough and at the axis about which the markings are .to be placed. The plate 24 rests on the plate 12 and the pivotal bearing block 16 rests on said plate 24 and at said axis. A threaded extension'20 is formed on the under side of the pivotal bearing block 16 and is adapted to pass through the opening 25 in the plate 24 and an opening 21 formed in the plate 12. The extension forms a snug fitin the openings and 21. A nut 23is threaded onto the extension 20 and bears against the underside of the plate 12 in order to rigidly secure the plate 24 and the pivotal bearing block 16in position.

The, ferrule 19- carrying, the pencil or marker 18 is mounted-on the bar 17 so that lowere'nd of the plate it may be reciprocated on said bar and must form a snugfit with same so that there will be no play or'looseness in its mounting thereon. 'The pencil or marker 18 is so mounted on the ferrule 19 that it will be substantially vertical in regard to the surface of the plate 24'. The marker 18 is preferably reciprocally and resiliently mounted in the ferrule 19 so that an even pressure will be exterted by the point of the marker onthe surface of the plate 24. In order to so mount the pencil or marker 18 on the ferrule 19, a recessed portion 26 is formed on the underside of said ferruleand an opening 27 is formed from the upper side of the ferrule intosaid recessed portion. The pencil or marker 18 is reciprocally mounted: in the opening 27. "A compression spring'28 impinging against the end wall'of'the recess 26 and againstapin or shoulder 29 formed adjacent to the lower end of the marker 18 tends to retain said-marker in contact with the surface of the plate 24. In order to prevent looseness or side thrust of the marker in its mounting'inthe ferrule 19, a ring 30 having a centrally located opening'31 forminga snug working fit with the V marker 18 may be threaded as at 32'into the/lower portion of the recess 26. A lugor'projection 331's formedon the upper surface of theferrule 19 and is adapted to engage on lifting the marker 18 and rotating same a partial turn, a pin or projection 34 formed adjacent the upper end of said marker to effectively retain same out of engagement with the surface of the plate 24. A knob 35 may be formed on or secured to the upper end of the pencil 18 for better gripping the pencil to adjust it. Y

In order to fix the bar 17 in any angular position in regard toia radial line from the central axis of the plate 24, aplural-ity of indentations or openings 36am formed in the from said central axis and areadapted to be engaged by a pin 37 carried adjacent the end of said bar 17. The number of openings 36 is preferably 360 or a multiple thereof, correspending to the number of degrees in a circle.

11 at regular intervals a-nd'equidistant.

The openings are graduated as at 38 from zero point, similarly to the markings on a protractor, to denotethe number of degrees inv the angle betweenthe zero point and the particular opening into which the pin 37 may bar 17 and-adapted to be reciprocated at right i angles to the longitudinal axis of said bar 17. A screw 41 is rotatably mounted in fixed bearing blocks '42 andthrea'ded through the block 40 and has its longitudinal axis parallel to the path of reciprocation of said block 40.

.A graduated knob or dial 43 is fixed to one end of the screw 41 to indicate the distance travelled by the block 40 on the rotation of the screw41.

In order to provide a fine radial adjustment for theferrule 19 on the bar 17 when it is desired to place. the marker and retain same atthe proper distance a screwadjustment may be provided.

bar17 is graduated as at 46 to denote the relative position of the marker 18 in regard to the central axis. A screw 47 to the end of the screw 47 to indicate the ro-'= tation-of said'screw and'the distance through whichthe ferrule has been reeiprocated.

This 'device is forming circumferential and radial markings in regard to a fixed centre. eration thereof, thepivotal block 16 is mounted at the central axis about which the markings are to be placed in the manner as de scribed heretofore. When it is desired to mark radial lines or boundaries only,. thescrew ad ustment governing the reciprocation of the ferrule 19 on the bar 17 is detached from said bar 17 by the removal of the screws or bolts 50 and removing the nut 51 from the groove 52. The ferrule may be now freely r reciprocated on the bar 17 and by disengaging the extension 34 from the raised portion 33, the pencil or marker is brought into contact with the surface to be markedof the plate 24. The pin 37 is now placed in the proper opening 36for securing the bart17 in the required position for forming the particular radial line at'that angle; If it is desired to set the bar 17- at a point midway between two degree points, as indicated by from the central axis,- Theparallel with the bar 17 and I rotatably mounted at one end as at 48 in the particularly adapted for v In the 0pproper distance as indicated on the dial 43.

The radial lines or markings may now be formed by reciprocating the'ferrule 19 along the bar 17 the proper distance, according to the length of the line to be made.

When it is desired to form circuinferential markings or arcs in regard to a central axis, the nut 51 is placed in the groove 52 and the block 49 is secured to the bar 17' by the screws or bolts 50. The ferrule is brought to the proper position in regard to the radius of the circumferential are or circle to be formed by rotating the screw 47. The pin 2-3? is lifted so that it will be disengaged from the openings 36 and the bar 17 carrying the ferrule 19 and the marker 18 may be pivoted about the central axis to form the proper circle or arc. I

In Figure 6 is shown how a routing or engraving tool may be mounted in the ferrule 19 in place of the pencil or marker 18. The numeral 60 indicates the routing tool. The shaft 61 of the tool 60 may be journalled in the opening 27 and also adjacent to its lower end in the washer 63 reciprocally mounted in the recess 26. The Washer 63 bears against a shoulder 64: formed on the shaft 61. The

spring 28 impinges against the upper surgage the tool 60 from the surface 2%, a nut 65 is rotatably mounted at the upper end of the shaft 61-and bears asat 67 against the collar 66 secured on the shaft61; A lug 68 is formed on one side of the nut 65 and I is adapted to engage the shoulder orlug 33 on rotating said nut to the proper position, to effectively retain the tool out of contact with the surface 24.

What I claim is:

1. A device for guiding a scriber, a platform for same having a planed upper surface, there being a plurality of recesses formed in said upper surface and at regular intervals and equidistant from the central axis of said upper surface, a bar pivotally mounted at one end at said central axis and offset from and parallel to a radial line drawn from said central axis and adapted to be pivoted about said axis in a plane parallel to the surface of said platform, a ferrule reciprocally mounted on said bar and adapted to carry the scriber and so position same that the point of said scriber will fall on said radial line, means for releasably locking said ferrule at any required distance from the central axis, and a projection carried adjacent the end of said bar adapted to engage any of the recesses to releasably lock said bar in any position in the plane in which it is pivoted.

2. A device for guiding a scriber, a platform for same having a planed upper surline from said centralaxis.

face there being a: 1 offrecesses "formed inasaidupper-surface at regular int'ervals and equidistant'from the central axis of said upper surface, a'bar pivotally mounted'a't one end at said central axis, a ferrule reciprocally mounted on saidbar and forming means for carrying the scriber in such a manner that when said ferruleisr'eciprd cated on saidbar, jthe point of-the scriber 1will" fall'along a radialli'ne fromisaidpivoting point or central axis, means for releasably locking sndremueto said bar at any required distance "from-.jsaid central 7 axis, a

block mounted on said bar adjacent the end, a pin-mounted in said blo'c'lrandadapted to engage said recesses; and means forvarying the "relative position of said blockwith respect to said bar along'a line normal is. A device for guiding a scriber time ing arcuate lines on a planed surface of a reciprocally mounted on said bar and adjacent the end thereof and adapted to reciprocafe in a direction normal to a radial line through said pivoting point and in a plane parallel to said platform, a screw through.

said blockand adapted on rotation to reciprocate said block in its mounting, a pin on said block adapted to engage openings in said platform to releasably lock said bar in,

any position in the plane; in which it pivots, and means for releasably locking said ferrule on said bar at the desired distance from said central-axis. 1

v4. A device for guiding ascriber formak ing radial lines'on a planed surface, a platform adapted to support a sheet, disc, or the like on which said markings are to be placed,

a block adapted to engage and lock said plat form and said plate at the central axis,-a bar pivotally mounted on said block at the central axis of said platform and in a plane parallel to said platform, a ferrule reciprocally mounted on said baradapted to carry the scriber in such a manner that the point thereof will fall in a radial line through said central axis, a screw parallel with said radial line to said-central axis and adapted to be rotatably mounted on said bar, a gripping mem- I ber rigidly secured to said screw and having suitable graduation-marks, a nut threaded onto said screw and adapted to'releasably engage said ferrule, means for releasably mounting said screw on said bar, and a. pin

carried by said bar adj acent the end distant .130

from the pivoting block of said bar, said pin being adapted to releasably engage indentations in said platform spaced at regular'intervals and 'equidistantfrom the central axis thereof. I

5. In a device for guiding a scriber for making radial or circumferential markings V on a planed surface, a platform adapted to support a Work sheet on which said markings are to be placed, a block adapted to be :secured to said platform and to engage said sheet at its central axis to retain same in fixed relation with said platform and said block,

a bar pivotally and radially mounted onsaid block, a pencil carrier reciprocally mounted on said bar, means for releasably locking said carrier at any place along said bar, means for releasably locking said bar at select points about its pivotal block, and means including a Vernier adjustment-for pivoting said bar a slight distance independently of locking means. i

' Signed at the city jof Toronto, this 29th day of October, 1928.

- LFRED ORDE TATE.

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